Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é o valor de 1998 se o valor de 2007 for 8?
 ###Tabelas: CREATE TABLE 1972_isle_of_man_lightweight_tt_250cc_final_standings (1972_isle_of_man_lightweight_tt_250cc_final_standings_id AUTO_INCREMENT PRIMARY KEY, Place INT, Rider VARCHAR, Country VARCHAR, Machine VARCHAR, Speed VARCHAR, Time VARCHAR, Points INT) CREATE TABLE junior_under-20_women (junior_under-20_women_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Fastest time (s) INT, Wind (m/s) INT, Athlete VARCHAR, Nation VARCHAR, Date VARCHAR, Location VARCHAR) CREATE TABLE bafa_national_leagues (bafa_national_leagues_id AUTO_INCREMENT PRIMARY KEY, Team VARCHAR, Location VARCHAR, Years in senior / adult league VARCHAR, 2013 BAFA Adult division VARCHAR, 2013 BAFA Adult flag division VARCHAR, 2013 BAFA Junior division VARCHAR, Other teams VARCHAR) CREATE TABLE weekly_ratings (weekly_ratings_id AUTO_INCREMENT PRIMARY KEY, Episode VARCHAR, 18-49 VARCHAR, Viewers (m) INT, Rating VARCHAR, Share VARCHAR) CREATE TABLE the_reform_of_the_national_water_and_sewerage_corporation (the_reform_of_the_national_water_and_sewerage_corporation_id AUTO_INCREMENT PRIMARY KEY, 1998 VARCHAR, 2000 VARCHAR, 2004 VARCHAR, 2007 VARCHAR, 2011 VARCHAR)  
SELECT 1998 FROM the_reform_of_the_national_water_and_sewerage_corporation WHERE 2007 = 8